Back-rest arrangement



Nov. 5, 1929. P. w. OLSON 1,734,130

BACK REST ARRANGEMENT Filed Feb. 18, 1927 Patented Nov. 5, 1929 warren stares PERCY VI. OLSON, OF PAUL, MINNESOTA, ASSIGNOB. 'lOjWILLIAM S.-FEBRIS, OF ELKHART, INDIANA, TRADING AS THE DOMOEE CHAIR COMPANY BACK-REST ABRAN GEMENT Application filed February up a back rest in connection with chair or likev seats and which back rest is readily adjustable to the convenience of the occupant. A further object of the invention is to pro- Vide such an arrangement including a pair of substantially uprightback rest supportingv side arms or risers which are pivoted at one end with respect to a normally fixed part of a seating device so as to be capable of being brought into the desired angular position with respect thereto and aback rest member which may be adjusted into different posi- 0 tions longitudinally of said side arms or risers as desired by the occupant.

Still another object of the invention is to provide such an arrangement which may be readily applied to a school desk or like seating device whereby the back rest may be quickly adjusted to the occupant to insure a correct and comfortable posture.

In the drawings Fig. 1 is a fragmentary perspective view showing an end of an ordinary school desk with one form of my improved back rest arrangement applied thereto.

Fig. 2 is a detail horizontal sectional View on an enlarged scale through that form of back rest arrangement shown in Fig. 1 the plane of the section being indicated by the line 2-2 thereon.

Fig. 3 is a view similar to Fig. 1 showing a modified form of my invention.

Fig. 4 is a detail horizontal sectional view on an enlarged scale through parts shown in Fig. 3, the plane of the section beingindicated by the line 44 of Fig. 3.

The invention is herein illustrated as being applied to an ordinary school desk and seat and will be so described but this is to be considered as by way of illustration only and not by way of limitation because the novel arrangement of parts forming my improved back rest may also be used in connection with rarest @FFHQE 18, 1927. Serial No. 169,181.

other types of seating devices where the peculiar characteristics thereof make it of advantage to do so. It is therefore apparent that I do not wish to be confined in the application of the back rest arrangement to school desks only so far as may be pointed out in the appended claims.

Referring now in detail to that embodiment of the invention illustrated in Figs. 1 and 2 of the accompanying drawings: 1 indicates as a whole an ordinary school desk which includes a rear horizontal desk portion 2, a front seat member 8 and a substantially upright member l usually forming the front of the desk and the back for the seat. The desk and said upright member are usually fixed'at their ends, each to anupright end frame member or casting 5 while the seat is preferably pivoted thereto as at 6 to be swung into and out of operative'position. The construction described is all well known and is to be taken as typical of a school desk such as is found in nearly all class rooms. In this instance the desk as a whole is to be considered asa seating device and a support or frame upon which my improved back rest may be readily mounted.

My improved back rest arrangement includes a substantially upright arm or riser one at each end of the desk. Preferably this arm is made of strip metal and its bottom end is pivoted to the member 4 near its bottom end as by means of a screw 8. The top end of said arm is bowed rearwardly in the plane of its edges and the extreme top end thereof is pivotally connected as at 9 to the front end of a rearwardly extending flat bar 10. This flat bar 10 has guiding bearing in a shallow U shaped bracket or clip 11 fixed in any siutable manner to the edge of the upright member a near its top end. In. said fiat bar is provided a plurality of longitudinally spaced holes 12 and in the bracket or clip is threaded a butterfly bolt 13, which also may be caused to enter'that hole 12 brought into registry therewith. By loosening this bolt and moving the bar in or out through the guide bracket it is apparent that the desired angular or inclined position of the riser 7 may be readily attained. When this position is attained and the proper hole 12 comes into registry with the butterfly bolt 13 the same is tightened up to lock the parts in place. In the riser 7 is formed a plurality of longitudinally spaced holes 14, the purpose of which Will soon appear.

Associated with the risers at each end of the desk as a Whole and not only connectingthe same but supported thereon for adjustment longitudinally of. the risers is a back rest member 15. Preferably this back rest member is bowed longitudinally as is shown and it is preferably padded or cushioned on its front side. To the rear side of said back rest memberis fixed a strap 16 the ends of which are bent as substantially a right angle to form short rearwardly extending arms 17. In some instances these arms may form parts of L shaped brackets fixed to the ends only of the rear side of said back rest member as is indeed apparent. These arms 17 engage the inner surfaces of the risers 7 and have suitable holes therein to register with the desired holes 14: in said risers after which bolts 18 are inserted throughthe said registering holes and butterfly nuts 19 applied thereto for tightening them up to secure said parts together. Thus the desired height of said back rest member 15 with respect to the deskseat 3 is readily attainable.

form of my invention which does not call for a ny substantial difference in form of the parts but only in their arrangement so that: therefore the said parts bear the same reference numerals. As shown in said Fig. 3, the riser 7 of the same is pivoted at its top end. to the member 4 and its bottom end is pivoted to the front end of the bar 10 which bears in the bracket 11 fixed to the member 1 near its bottom end. Thus the manner of attaching the riser in place is substantially the reverse from that shown in Fig. 1. The back rest member 15 is adjustably engaged with said risers as before described so that the manner of providing the desired adjustment of the back rest member up or down or' forwardly and rearwardly is substantially the same.

My improved construction is simple and inexpensive and provides a substantially universal adjustment for the back rest member whereby it may be readily adjusted to the best convenience of the occupant of the seat 3. It may also, be readily applied to school desks now in use and when properly adjusted for the occupant induces a correct posture therefor.

\Vhile, in describing my invention, I have referred to many details of construction as well as form and, arrangement of the parts thereof, I do not wish to be limited thereto except as may be pointed out in the appended claims.

I claim as my invention:

1. In combination with the back member of a seat, side arms pivotally connected at one end thereto, guides fixed to said back member, bars secured at one end to said arms and extending through said guides, means associated with said guides to engage and hold said bars and a back rest member operatively connected to said side arms.

2. In combination with the back member of a seat, side arms pivoted at one end to the edges of said back members, guides secured to the edges of said back member and through which said bars extend, means associated with the guide for locking the bars thereto and a back rest adjustably connected to the side,

arms.

3. In combination with the back member of a seat, side arms pivoted at one end thereto and having a plurality of openings therein, a guide fixed to said back member, bars with openings therein slidable in said guides and connected to said side arms, means carried by each guide to engage in the holes in said bar to lock the side arms in the desired angular position, a back rest member extending between said arms and means carried by the back rests and capable of being secured to said side arms in any of the desired holes therein.

4. In combination with a seat and a back member, side arms pivotally connected at one end to the back member adjacent the seat, a bar pivotally connected at one end to each side arm and adjustably secured at its other end to said back member to permit a change in the angular position of said side arms and a back rest member adjustably secured to said side arms.

In testimony whereof I have hereunto set my hand, this 14 day of February, 1927.

PERCY W. OLSON.

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